<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
     <!--  添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
         <el-table-column type="expand">
           <template slot-scope="scope">
             <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '','vcenter']" 
                      v-for="(item1, i1) in scope.row.children" :key="item1.id">
               <!-- 渲染一级权限 -->
               <el-col :span="5">
                 <el-tag closable
                        @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                 <i class="el-icon-caret-right"></i>
               </el-col>
               <!-- 渲染二级和三级权限 -->
               <el-col :span="19">
                 <!-- 通过for循环嵌套渲染二级权限 -->
                 <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" 
                          v-for="(item2, i2) in item1.children" :key="item2.id">
                   <!-- 渲染二级权限 -->
                   <el-col :span="6">
                     <el-tag type="success" closable
                             @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                     <i class="el-icon-caret-right"></i>
                   </el-col>
                   <!-- 渲染三级权限 -->
                   <el-col :span="18">
                     <el-tag v-for="item3 in item2.children" type="warning" 
                             :key="item3.id" closable
                             @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                   </el-col>
                 </el-row>
               </el-col>
             </el-row>
<!--          
            pre标签：美化结构
             <pre>
               {{scope.row}}
             </pre>
 -->
           </template>
         </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <!-- 通过作用域插槽自定义渲染 -->
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" 
                      @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" 
               width="50%" @close="setRightDialogClosed">
     <!--  树形控件 -->
     <el-tree :data="rightsList" :props="treeProps" show-checkbox ref="treeRef"
               node-key="id" default-expand-all :default-checked-keys="defKeys"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  name: 'Roles',
  data() {
    return {
      //所有角色列表数据
      roleList: [],
      //控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //所有权限数据
      rightsList: [],
      //树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //默认选中的节点Id值数组
      defKeys: [],//通过对应的id值将该权限默认选中
      //当前即将分配权限的角色id
      roleId: ''
    }
  },
  created() {
    this.getRoleList()
  },
  methods: {
    //获取所有角色的列表
    async getRoleList() {
      const {data: res} = await this.$http.get('roles')
      if(res.meta.status !== 200){
        return this.$message.error('获取角色列表失败!')
      }
      this.roleList = res.data
      //console.log(this.roleList)
    },
    //根据id删除对应的权限
    async removeRightById(role, rightId) {
      //弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该用户权限, 是否继续?', '删除权限', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).catch(err => err)
      //如果用户确认删除，则返回字符串confirm
      //如果用户取消删除，则返回字符串cancle
      //console.log(confirmResult);

      if(confirmResult !== 'confirm'){
        return this.$message.info('已取消删除')
      }
      const{data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if(res.meta.status !== 200){
        return this.$message.error('删除用户权限失败!')
      }
      this.$message.success('删除用户权限成功!')
      //不建议刷新页面，会将打开的权限列表合起来
      //this.getRoleList()
      //将拿到的最新数据重新赋值
      role.children = res.data
    },
    //展示分配权限对话框
    async showSetRightDialog(role) {
      //将拿到的id保存到data中方便使用
      this.roleId = role.id
      //获取所有权限的数据
      const {data: res} = await this.$http.get('rights/tree')
      if(res.meta.status !== 200){
        return this.$message.error('获取权限数据失败!')
      }
      //把获取到的权限数据保存到data中
      this.rightsList = res.data
      console.log(this.rightsList);
      
      //递归获取三级权限节点的id
      this.getLeafKeys(role, this.defKeys)

      //点击分配权限按钮让对话框显示
      this.setRightDialogVisible = true
    },
    //通过递归的形式获取角色下所有三级权限的id，并保存到defKeys中
    getLeafKeys(node, arr) {
      //判断是不是三级节点(三级节点没有children属性)
      if(!node.children){
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    //监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    //点击为角色分配权限
    async allotRights() {
      //将调用这两个方法返回的两个数组合并到keys数组中
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      //再将拿到的id数组形成一个以','拼接的字符串
      const idStr = keys.join(',')
      //再发送请求，传到服务器
      const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
      if(res.meta.status !== 200){
        return this.$message.error('分配权限失败失败!')
      }
      this.$message.success('分配权限成功!')
      //刷新角色列表
      this.getRoleList()
      //隐藏对话框
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }
  .bdtop {
    border-top: 1px solid #eee;
  }
  .bdbottom {
    border-bottom: 1px solid #eee;
  }
  .vcenter {
    display: flex;
    align-items: center;
  }
</style>